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Method for extracting valuable metals from high magnesium laterite nickel ore

A technology for laterite nickel ore and valuable metals, which is applied in the field of extracting valuable metals from high-magnesium laterite nickel ore, can solve the problems of poor oxidation effect of ferrous ions and poor removal of impurities by iron ions, etc., and achieves improved Effect of iron removal, reduction of heat loss, improvement of removal efficiency and effect

Active Publication Date: 2022-07-22
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for extracting valuable metals from high-magnesium laterite-nickel ore, to solve the problem that the ferrous iron oxidation pH is much higher than the sinking alum pH when adopting the ferrite method to remove iron in the prior art, resulting in In the pH range suitable for sinking alum, the oxidation effect of ferrous ions is not good, which eventually leads to the problem that the removal effect of iron ions is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The composition of the high-magnesium type laterite nickel ore processed in the present embodiment is as follows:

[0036] element Ni Co Cr Fe Al Mg Mn content,% 1.99 0.0170 0.37 7.62 0.10 19.31 0.230

[0037] The liquid phase composition of the acid leaching slurry of limonite-type laterite nickel ore is as follows:

[0038] element Fe Fe(II) Fe(III) H2SO4 Concentration, g / L 8.65 5.34 3.31 35

[0039] The above-mentioned limonite-type laterite-nickel ore acid leaching pulp is used to carry out atmospheric leaching of high-magnesium-type laterite-nickel ore, and SO is introduced into the leaching system during leaching 2 (The flow rate is 2.4L / (L liquid·h)), the leaching temperature is 95°C, the leaching time is 1h, the sulfuric acid concentration at the end of the reaction is 11g / L, and the leaching rates of Ni and Co are 64% and 62%, respectively. The leaching pulp is obtained.

[0040] Add Na in lea...

Embodiment 2

[0042] The composition of the high-magnesium type laterite nickel ore processed in the present embodiment is as follows:

[0043] element Ni Co Cr Fe Al Mg Mn content,% 1.75 0.070 0.88 14.83 0.64 13.32 0.34

[0044] The liquid phase composition of the acid leaching slurry of limonite-type laterite nickel ore is as follows:

[0045] element Fe Fe(II) Fe(III) H2SO4 Concentration, g / L 7.62 6.73 0.89 42

[0046] The above-mentioned limonite-type laterite-nickel ore acid leaching pulp is used to carry out atmospheric leaching of high-magnesium-type laterite-nickel ore, and SO is introduced into the leaching system during leaching 2 (the flow rate is 2.4L / (L liquid·h)), the leaching temperature is 95℃, the leaching time is 1h, the sulfuric acid concentration at the end of the reaction is 4.6g / L, and the leaching rates of Ni and Co are 67% and 93%, respectively. The leaching pulp is obtained. .

[0047] Add Na in l...

Embodiment 3

[0049] The composition of the high-magnesium type laterite nickel ore processed in the present embodiment is as follows:

[0050] element Ni Co Cr Fe Al Mg Mn content,% 1.75 0.070 0.88 14.83 0.64 13.32 0.34

[0051] The liquid phase composition of the acid leaching slurry of limonite-type laterite nickel ore is as follows:

[0052] element Fe Fe(II) Fe(III) H2SO4 Concentration, g / L 7.62 6.73 0.89 42

[0053] The above-mentioned limonite-type laterite-nickel ore acid leaching slurry was used to carry out atmospheric leaching of high-magnesium-type laterite-nickel ore. 60% and 79% to obtain leaching pulp.

[0054] Adding SO to the leaching pulp 2 (flow rate is 0.51L / (L liquid·h)), while feeding O 2 (the flow rate is 48L / (L liquid·h)), the reaction time is 2h, the reaction temperature is 85°C, and the pH of the solution is 1.90 after the reaction is completed. After the completion of the reaction, the concent...

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Abstract

The invention provides a method for extracting valuable metals from high-magnesium laterite nickel ore. The method includes: using limonite-type laterite nickel ore acid leaching pulp or dilute sulfuric acid as leaching agent to leaching high-magnesium laterite nickel ore under normal pressure to obtain leaching pulp; removing iron from the leaching pulp to obtain nickel-cobalt-containing ore solution; the iron removal step includes: adding a first sulfur-containing reagent into the leaching pulp, while introducing an oxidizing gas for oxidation, then adding a precipitation agent to the system to carry out an iron removal reaction to obtain a pretreated pulp; adding the pretreated pulp A neutralizing agent is added to adjust the pH value to 2.5-4.0, and secondary iron removal reaction is carried out to obtain iron removal slurry; the iron removal slurry is subjected to solid-liquid separation to obtain a nickel-cobalt-containing solution. Based on the method, the present invention effectively improves the iron removal effect of the high-magnesium type laterite-nickel ore leaching solution.

Description

technical field [0001] The invention relates to the technical field of laterite-nickel ore treatment, in particular to a method for extracting valuable metals from high-magnesium-type laterite-nickel ore. Background technique [0002] With the gradual consumption of nickel sulfide ore, the contribution of laterite nickel ore to nickel production continues to rise. For limonite-type laterite nickel ore, which accounts for a relatively high proportion of laterite nickel ore, high pressure leaching (HPAL) process is still a relatively mature treatment method. However, limonite-type laterite-nickel ore does not exist alone in the mining area, and usually accompanied by a certain amount of high-magnesium-type laterite-nickel ore (residual ore, the content of magnesium oxide is higher than 20%), and the leaching performance of the two laterite-nickel ores is quite different. . In addition, the pulp after high pressure leaching sometimes contains a certain amount of high-value ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B3/08C22B3/44
CPCC22B23/043C22B23/0461Y02P10/20
Inventor 刘诚丁剑孙宁磊李勇秦丽娟李诺刘苏宁彭建华
Owner CHINA ENFI ENGINEERING CORPORATION